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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3d64e5744a60f9a8886278602d764484d24eb88f9fd00adccab9ca81a7e55e7' 
  AND token = 'OJgAbnb14w7cEC7jQRyPdZkhcVZRkjpY6DVNE84J8VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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