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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae17a41b166d9308455f48ca5a675c4c97f4f474a4bb5de20ee7ff6b361f318' 
  AND token = 's9sPQJSwOv3eHqjodjC4ffSK4z0jul+sYMbKWjf88Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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