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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df79237687c4643b9ad235a1eb1ef7554c849adabafa9b97255027748d43be0b' 
  AND token = '6OWdrb6RqfI6mCFqG53e19oeyceRYdl6NV3UFc/+GMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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