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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1c19ff14a8cea74750de3ee955728f0f3fef4b95a44fea0fc89787e3a36587f' 
  AND token = 'ShY4yZGUKnT5cTL1gwqpd10U4PSQ0ayt6IHhnNoVjRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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