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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2db0d38f7ef54c8b3a9a5c110e90c3c613a223fd8176517477da6a77393617c3' 
  AND token = '0MbqP3/3fbTxDusksw3KyJHS/Q2cZwJp4J4vTcFaV/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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