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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82b4e6088720fcaad0cb7d91bed7b843c465ac1cae81799ad26a6298304e81a7' 
  AND token = 'p3+DWzl60CE6P9QNUlFLsxvErRuLrwjDQ3/LygZsPpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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