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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e94dcfb712b3c2d752cb7fea4b0d4b69efc46e8e33c11a64d52df916c7661de' 
  AND token = '98TAYdWK+BwTt5QPWwx5diZ7Jhu+UTweOfbKvSNF040=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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