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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fb7ddd960bf149ead4ce5ace5647a254759408f31c0ee2d635d01a977232122' 
  AND token = 'n4k/zQd4hk+LLuadwOTsTxAaUwpQ8F6ur3B7F7rvnDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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