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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b389282dd6f3c729ac9c0d2a5b8e206a6960ccc084cb22fd11e126ef0e6711f1' 
  AND token = 'ypjlYp8RZouWX3JrMBs7Po5GyVgthLBuu8b7NmQLC4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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