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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c729a3eab618e42fc6bc22b23f8801aef73e81a060762277bab2cbd5bba3f8b7' 
  AND token = 'zIe0HuhpNXqCx8HFc9MjTXXUqrRJ9wmEyUV9y2FJZ4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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