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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f8dd57d4c001e947236d7caea8c5c779bdf4458dd475bbc7aea96f2a7f80c7' 
  AND token = 'sh5QFvjq7U5CQwmR4Yw7wAle6Xt+uY5baumuxF9RZd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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