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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2037e992e41e3990b7c79c81c342d4f6d7cec661342e9c5238fb532d30dea538' 
  AND token = '0UmMCtdRbZW/Djovd34MhpMbHfRwJXCOWyH/GDxjEEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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