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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b9796a163b0c66bac6cf67179c38ff781cc64a8a9159c30151b887703fa6ab1' 
  AND token = 'qSL069nxu/7Du4UDMKTBJHk8bpd/oHvwR6Ca+xPo25w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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