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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce53f0b2c80e5e51fac35ec1f780f88101b5aed1ff32554f4a81939c7523b56' 
  AND token = 'UZCb/ysXKA/fcEvUDDCssFX23aaNHyG/Sujnl6hegzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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