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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4893ea88cc573bf47c8a826d48de8a23ada91b28807ca8af7f01e1bf710715c' 
  AND token = 'a01NIx8oiwUwViv7dM6YTtL4YxZcZGURD+YciduQ2V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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