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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ba597cebb3b0de1de7965ac08a0a2c88ed8b02227e72f545d816b942d03bd6' 
  AND token = 'lNlwumheXAmUKvHL5+gU94k9+kfuD0p+wAmMeM5vYck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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