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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ec3b76729fdac18dfb979cbb8560672b8773bd4ce1fc4daa4cf554dff3870f' 
  AND token = 'sbO5feEuN9C9jGgjceIP+2vYW8yjdC8gJ9XjTRwzB28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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