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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cb1038b13a0cedead66dde5ef81f52dcc25bedc338243df6759e98422bf8914' 
  AND token = 'T6qwFDUjq3Pi3Hl0QyX/Im15gdk9fCynOQZaX4IGP+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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