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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac803bfccde3ba55015ba6952054ae0e2d9a0460585c2811d50fc67ab62e0bd' 
  AND token = 'afg4xx2ERnu81qJhVO8JR4TbZzMWvskywOTzWBtHvyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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