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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1de2050f5ba5d6c00dbf6ca5545f1333b89ecacf0cf66b1d1f8dabe8f55c5b9c' 
  AND token = 'bfMYxQ9N3UiSNZDWYhh6PHJwer/buyM86mZmI8iEVCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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