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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17e6ba31fddf53125fc5ef59a43e03fd8532828f3d57cb19f39e80d6c86ffdcd' 
  AND token = 'DQp8hRtq4aLTDdnHzVOc98xca4Jypmy37P0DBJ1KE54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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