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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '447954fe689e4e87393bf523dd178f1cc1b1bbbe5f54e3792bc5042f6b3939b4' 
  AND token = '5J1wc4w1WncwcpLCFBGzp3sQuJhx2k97N9qGuk1MmII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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