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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b31641b9813449388ed117edf14125531f9da6583ab7787e4a25452857399e84' 
  AND token = 'McpdfV2XdY92qKFa8yY2k8xC9vtL9KHrAexg+yYG6Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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