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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb442a4c7683c0be2fa8d1ef720dae3a40c76656a737b79fd4efaeb5c01c6a7' 
  AND token = 'thLfR7J9DVOFk9Be4f/wT6HuEPdb+RoSSQRPvH9Q+tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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