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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '918c71f285355ac6e59073083e76b3ba231dadd5f8ad40655a0a18920a9c69a5' 
  AND token = 'Wr7rDf84jidWS6L4hfFAsoIqoVt5JroQCAo7VsuSxO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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