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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9345aac34c4a316818b1fe41782d2bc5eed86e4993b3c99f1c590fd7ed94fe61' 
  AND token = 'cS2r1PO3lKtFvanS5QMe1gNIMxu/BXPmQ39sSNEZp1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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