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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '894714e5ff4c77f332404dfc50e1b6b40f5740fb7df4d811919c90d1bbb34f93' 
  AND token = '55tv5wYgAmbRQ0dOMvUpYVYjq0HfhKczr5zN+gkDA+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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