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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617e70487049ea2dfdf6db47bea6c08c2d8b92339d02efd3cb896bba65610c08' 
  AND token = 'Ng8u5OYiqOCM30wIS7RXWIYT4vvZ362QtLylzl4+GPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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