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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00dea3ce60e930664572ffe81b89f398c6640fdcf44ad0e068f76f0e65cdc21e' 
  AND token = 'n4qeCg53JNU5Jp6m/ByGcG1MrVo3/bAxLv/vbbVxM9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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