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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae89c68223443e1a799bfbf5e87eee8fed711b8019878f5413219470935fe9f' 
  AND token = 'TnBQzgsSQKJGJmrr1hUCOyKAYwmPZ94S6UgmA6frS9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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