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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3410406f36f11d07c5823fde5466ed9ee37e5ce1a0ac951d71ee25ce90272247' 
  AND token = 'dJcYu478xxySbZA/S6V1jliRrjVavldtKd7YUjHLD2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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