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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c9ad9d47fd995b5e2f0762bde1aa4b9439cfbf64a1bba914091d7fcd5fc2510' 
  AND token = 'kPmQ4s/vCCyJhCdG0Wk9uZ56erAo7aZcdYX9bMZmr7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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