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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2721549944dc82ef11e5bff57ad13f5123413f030964bcec42992034dc4b87b1' 
  AND token = '8PHOYBFOgDcLvy+0jZ29cjVKO1kiV9ygTJBW9abbMzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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