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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6ca83d370cfd30df557c07cd456c0a9ed838d5148ae8ff046597f52a1870fc3' 
  AND token = 'QU9W73N8TXHz6KWCkoU9OYheYhBQ8rF6HCc7lCTPQ8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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