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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb144210c547bdbad96f90337e9917cd8f08e003e0d8e3e920a5e96fd55a2fe' 
  AND token = 'UjRC4qqcMPNHDjjPXybeFfHSE0wd1m41C9xYDT+oDmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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