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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe56db6fcc427aef65c393c36009615b6a02c9afe619774086149ca473feba2a' 
  AND token = 'xA359ZwkTs6AlTbTac7tX+9h0RjT5/fb7c+IOCNiWHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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