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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d3ed545cef1c49a4fa55c5c5a2c46c3dba2ef7df8ed84cc163008749ad3d2f' 
  AND token = 'E/ZZeR6uuYbd/jiL57Bck5UKwADOUHK7Lz/TbbQFwmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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