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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a79e3baa46e1ff448a94a34112e964e239bc0da9f69b087beeb33fad0d35dc58' 
  AND token = 'MwIVV8op2pF7OxqPp2hKUjXDbAc8gWRlcAlLaS2ZKMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}