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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ff3024e22c8095af8b097f551b5e16c1e0cbfb76558e21c02de19250ed1a93d' 
  AND token = 'VymNPax+r5J0TOz81jC6FL06RFOZwVYLW4Fwd1mxsHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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