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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bef22d023d9a63c555a7318dc68adfee919020f072251103564ff3fdd0eb24b8' 
  AND token = 'NQIl7MIEXSMxacQdvIoIgC0JXtKpT7FJpO2cZgevcwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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