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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3837689d0de0ebb9785fdfb0eef90a36e861e57c31f7071db9679888875e0911' 
  AND token = '686eg1Ucs7JQK7QCpDBKAafeOl8Z9giT5361bzosPEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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