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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '239ddf0fcfb7e05315b8908f29d63c7e6b9923a67d4a8f07355630393a6e6a51' 
  AND token = 'q62Jm+jqG6B4+dXmzuKPa0tarHaLy17ft9UWFm1a9Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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