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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca4c19268c76a2a19b21d650c72f01365d3538e4ea7e0ba5f0d84f72c7c830f5' 
  AND token = 'ggWdbEfJn+Q+Ui8Cj4RgOEPfP7jWNPJw2ImFfp9UuTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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