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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f502e8a54543a810049558c7545ed3a9b528d81c852f2131d44792a46cd9b43' 
  AND token = 'L2408UL99W9zyrtix2F5SBVMnKaaqC/OyeQW0d1ae2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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