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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '008a4cf14950a1d16fa16c6091b28d4b847317c8ba8ae6982bf21355b927e4dd' 
  AND token = '1CQW89B8TH02M+P65Ukc6uzEro/J4NGhykoqDmbSO/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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