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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7b79b6557766a480abffdb0842af58a77628e243a24ed8d954f4cbb231718e9' 
  AND token = '46vaAGqRN9RCeRxiGU3clg8Fl85njep6gpq0BtYU3xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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