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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdb821a5ccfd7a4d29d97e83856435bd0daf61799ea3a7f761dbe13230d30516' 
  AND token = 'Th05l7sIVLNhJXBPCWtsXOGUygcycXvMPEemS9GN75I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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