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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4a7cf860e058d03f43d41cc1d6dbfad507349d383db1117880fdac977c3b488' 
  AND token = 'yHxsRjXvmZsWdG6a7noc+rD94zY7aJ2L2w/Pl0OEt64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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