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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9092715586b83c6a008c810d32f9b25a31d143e836a5a48cbfca2ca649058a37' 
  AND token = 'rrq/q9Wq4UeaIuZ3fjzk2MQXXlvLWo7bTLLN0vjA/gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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