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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6138a1f2d0fee1a98838a2b63e2dc783e67abf0bdcc05700601899029eb65a76' 
  AND token = 'm9+vaxctvVqmkSAqSq6oqiCR1cITT0iJfBc7Ud+ZoT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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