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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d5e8e430b61adaa681f2db6fbfb00a955328e0ef74fc8ddc2da08a2d8e1b60' 
  AND token = 'K4qMvPoM5hcSqmEXydYBpBMIGu3clvGXqib1BzR+ef0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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