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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e22caa888c74515a8c41ec2da2bad8a85f9b5f1e8bfa6e4363916026946172' 
  AND token = '2bqKIsvOeVxSjiYcD6pjE6S0xkYnsJVMakxDBa+wVh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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