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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d0a20c7df461d87dd493133774c4274991fc4aaf3e0ba68c229cce36101b7d9' 
  AND token = 'YwEQ+7BP2KH1+wMerwNp82anr9xU91kqRu2C7DNrfuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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