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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cbfd3a0c4236f4dcfedfe3745213bb1d7f0f8eae755cfee62d82df41cc0b9d8' 
  AND token = '1Tarao4G+/gYuky9aksYR6YIg0oME+L9bIhl8pSzMb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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