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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd485feea5510a5cc2f4b417dc13bb13541312cc7a2a6a92ef29a5e9e34f9601a' 
  AND token = 'LkbacikrUZHUHZttJXC+JQ72xjU1k19P7veaoUBiTiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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