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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c2913baa47d8055a1a9ae817151277dc5d7e742a73b1676f3768478887fe22e' 
  AND token = 'Xx0WO2AzWYuJ350uffhYhkLRT5MDgxyN1vOZHkTY1jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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