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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0896184be8d4408a3a3b2ba45b221eeceddcde537a34add5ae1f39a4688ecab1' 
  AND token = 'rqXW0epWzS5pSv5YHvPEgOSfquqJ5WT/68PJ1xWabcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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