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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd200cfc0d41d456f6c56ecbe54420766f89b388aa07284444b80e4e166b85c9c' 
  AND token = '/7VkeRHeaaIw1NT6tqgTmzs/Ahuyi/DQi5YA7YrinMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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