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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08dfacf852a60601ba3623000a786176ad7e933618e45266d5b79c4edb363844' 
  AND token = '8dpTAYa6Gm+Xz1DLTD16dIreXXM3u4wcOlxnC6ZHKuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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