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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8daff1aed6ac3a51259a81c5e18acd0bbdf60f63d7e2e3683a04fdf91b9ecb4' 
  AND token = 'zat4wUI059vz6/DXZLf43aowR4ykrTIBK6mz03XysWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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