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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08f3ea9b912be5d9af0991038bc3022a9330a84a3f279005f07868e12a5bff4a' 
  AND token = 'Ccjlo0hzNzYV/IYyxKQmUBuErA0nUrHhXW14njwEWsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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