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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd36eb9c26f7376f7bb4194546957cd9d215d5994779b1aa0ca3821a4133703' 
  AND token = 'M7LTqml79FKN5l68C7boHl2688/PvMUxytIWyR6nLkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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