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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59faa29e97ee31ee3059fcbfb0ad87693eed33fa55876ae21639a8dffc54cc33' 
  AND token = '8XfZLwYzi0TQa/YRDmV2BTr3Z02nth407cvwHIQ2TgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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