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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57a1a3b9fdfe44b1ca11f196c5076a745e24dbf353edf9f870a0d8e78205d77a' 
  AND token = 'jCCxKqvhIUtRUTws7c+/7DKLt6/4dty94EwUUQTqzQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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