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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc34052b5bd8604e6bc6c53d22cb95bd44b4bb39e0c6ba98b60e0ce2cacdf3ef' 
  AND token = 'tsIf9GXjVpQOSAOPyGtD+HpHoZZnj8w7HDGkLK1P44k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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