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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '840fa9d0211340ce0d47365d117130adadb77f1fe584302a9324a4432e91036f' 
  AND token = '/KJPv349AvfeeQKOOsDXKZF+ZtgrEZehvxG/vKioShY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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