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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a2dbe60276102227996f1766360e8a2791ad53e644b0caa83e493c3f94a3b37' 
  AND token = 't4AHAQOr504SjC3xvjTViYokwj/ryEGvuO72e1ETvbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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